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 ###Instrução: Qual é o Try Diff, quando os Pontos Contra são 213?
 ###Tabelas: CREATE TABLE pool_2 (pool_2_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Tries for VARCHAR, Tries against VARCHAR, Try diff VARCHAR, Points for VARCHAR, Points against VARCHAR, Points diff VARCHAR) CREATE TABLE by_access_to_electricity (by_access_to_electricity_id AUTO_INCREMENT PRIMARY KEY, Region VARCHAR, Public network VARCHAR, Own/community generator VARCHAR, Solar panel VARCHAR, Other source VARCHAR, None VARCHAR) CREATE TABLE list_of_nyagatare_sectors_by_population_2012 (list_of_nyagatare_sectors_by_population_2012_id AUTO_INCREMENT PRIMARY KEY, Rank in Nyagatare Sectors, 2012 INT, Sector VARCHAR, Area in sqkm INT, Population August 15, 2012 INT, Population, August 15, 2002 INT, Population Change 2002-2012 (%) VARCHAR, Population Density 2012 (km 2 ) INT) CREATE TABLE driver_standings (driver_standings_id AUTO_INCREMENT PRIMARY KEY, Position INT, Driver VARCHAR, Points INT, Starts INT, Wins INT, Top 5s INT, Top 10s INT, Winnings ($) INT) CREATE TABLE doubles:_11_6–5 (doubles:_11_6–5_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Date VARCHAR, Tournament VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents VARCHAR, Score VARCHAR)  
SELECT Try diff FROM pool_2 WHERE Points against = 213